CLAY, Circuit Judge. Defendants Demarco Tempo and Kenneth Sadler challenge the judgments in their criminal cases after a jury convicted them on various drug, gun, and obstruction of justice charges. Defendant Demarco Tempo appeals his convictions and sentence on a drug conspiracy charge under 21 U.S.C. §§ 841(b)(1)(A)–(C), 846; drug possession and distribution charges under § 841(a)(1), (b)(1)(C); and a drug possession and distribution near a school charge under §§ 841, 860. Defendant Kenneth Sadler challenges his convictions and sentence on a drug conspiracy charge under 21 U.S.C. §§ 841(b)(1)(A)–(C), 846; a drug possession and distribution near a school charge under §§ 841, 860; a felon in possession of a firearm charge under 18 U.S.C. § 922(g)(1); a conspiracy to obstruct justice charge under § 1512(k); and witness tampering charges under § 1512(a)(2)(A). For the reasons discussed below, we AFFIRM Tempo’s convictions and sentence, AFFIRM Sadler’s convictions, but VACATE Sadler’s sentence, and REMAND for a new trial on the sole question of whether Sadler was within the chain of distribution as required before imposing an enhanced sentence under 21 U.S.C. § 841(b)(1)(C).